Geometric telegraph.



No. 742,000. I PATBNTED 00T. 20,1903.

0.13. RossMAN. GBOMETRIC TBLBGRAIeI-L APPLICATION FILLD JAN 12 1903 I 14SHEETS-SHEET 1.'

/weioiv No monmJ .Q Q2 Qi No. 742,066. l PTENTED OG'IY. 20, 1903. I

G. B. ROSSMAN.

GEOMBTRIC TBLEGRAPH.

APPLICATION FILED JAN. 12,1903.

14 SHEETS-SHEET 2.

N0 MODEL.

www.

GQ Br. vROSSMAN. GEOMETRI() TELBGRAPH.

APPLICATION FILED JAN.' 12,1903.

No uonm.

ZQZ? my WSN .En K .n i? NN @ma EN NQ No'. 742,066.A PATENTED 00T. 2.0,1903.

G. B. ROSSMAN.

GEOMBTRIG TELHGRAPH.

APPLIOATION FILED JAN.A12, 1903.

W, M. a i

n :rens co. Puma-Luna. WASHINGTON. D4 a A No. 742,066. PATENTBD 00T. 2o,190s. G. B. Bossu/IAN.

GBOMETRIG TBLLEGRAPH.

A APPLIoATroN FILED JAN. 12,1903. No MODEL. l 1 SHEETS-SHEET 5.

yllllllHlllllHliHl x G. B. ROSSMAN.

GEOMETRI() PATENTED 00T; 2.0, 1903.

TELEGRAPH.

APPLICATION FILED JAN. 12,1903.

N0 MODEL.

y "mlm" y WHW/@JUNIN :l l

14 SHEETS-SHEET 6.

imllllllllllllllllhh l'llllll PATBNTBD 00T. 2o, 1903. Gr.15. RossMAN.GEOMETRI() TBLEGRAPH APPLICATION FILED JAN. 12,1903.

14 SHEETS-SHEET 7.

N0 MODEL.

PATENTED OCT. 20, 1903.

G. B. ROSSMAN. GEOMETRIG TELEGRAPH. APPLIOATION FILED JAN. 12,1903.

N0 MODEL.

` 14 SHEETS-SHEET 8.

avveniaz.

rn: Nonms frans ca.. mommumwunmnmn. ne;

PATBNTBD 00T. 2o, 1903. G. B. RossMAN.

l GBOMBTRIC TBLEGRAPH.'

APPLICATION FILED JAN. 12,1903.

14 SHEETS-SHEET 11.

N0 MODEL.

'me alims PETERS co.. PHomLnno.. wnsmlmncn4 u. c.

PATENTBD 00T. zo, 190e..

G. B. RUSSMAN. GBOMETRIG TELEGRAPH.

APPLICATION FILED MN. 12,1903.

l14 SHEETS-sum1 1n.

N0 MODEL.

/NVENTOH Imm; By 'sul' u 7 Arrow/Emi "No, '742,066.- l i PATENTED 00T.2o', 190s.

G.B.Ros'sMAN.

GBOMETRIG T-:LBGMPLL4 APPLICATION FILED JAN. 12v, 1903 14 SHEETS-HEBT13.

l I ATOHNEYJ PATENTED OCT'. 20,1903.

APPLICATION FILED JAN. 12,1903.

' f No MODEL.

mams PrrERs cs Puovounyu; msm

atented October 20, 1903i.

PATENT OFFICE.

GRANT n. RossMAN, or NEW YORK, N. Y.

GEOMETRIC TELEGRAPH.

SPECIFICATION forming part of Letters Patent N o. 742,066, dated..October 20, 1903.

Y Application led January 12, 1903. Serial No.13i8,698. (No model.) v ATo a/ZZ whom it may-concern:

siding at New York, in the county of New York and State of New York,have' invented certain new and useful Improvements inGeometricTelegraphs, of which the following is a full, clear, and exactdescription, such as will enable others skilled -in the art to which itappertains to makeand'use the same.

This invention relates to telegraphy; and

its object is to provide a new and improved means for developing ortransmitting Vgraphic processes. will appear hereinafter.

The invention consists in the features ofV construction, combinations ofelements, ar-

telegraphs, dac., all of which maybe classedv under the head oftelegraphs, autographic.

Within the scope of the invention are included the production orreproduction of cartoons, sketches, maps and drawings, manu'- scripts,paintings, &c.

In order that theinvention may be clearly understood, the laws andprinciples which are the' generic foundation thereof and a specificembodimenty for the utilization of which is shown in the accompanyingdrawings will rst be set forth. will be necessaryl to make frequentreferences to the art or method vfor the carrying out of which themachine-shown in the accompanyingdrawings is adapted, said method beingspecifically claimed as such in a companion application of even datewith this application. I believe both the art or method and the meansfor performing that method to be broadly new.

Operatively the art comprises the control by tele-graphic means of aninstrument or series of Ainstruments which may be individually termedgeometric tracers and the opl eration of those instruments under suchcontrol.

Further object's and advantages vtirely unguided,

Inv doing this it" The control of this instrument is of an itselfreadily to a'greatvariety of telcgraphic means "already existing. Thetelegraphic elements of the process maybe fulfilled with exceedinglyelementary character and lends l Be it known that I, GRANT B. RossMAN,re-

more or less facility by any means whereby telegraphy, or whether thetransmission is endiations. y

The geometric tracer is provided with a tracing-point, which may be apen, pencil,

as in the 'case of Hertzs ral brush, stylus, etching or engraving tool,or

this point upon a surface suitable for receiving a record is secured byits situation at the end of a rod which is restrained by guides thatallow it freedom of motion in the direction of its length, while theguides have themselves freedom of motion transverse to its length.Independent means are provided for imparting motion to each of theseelementst'. e., to the rod and to its guide. The path of thetracing-point upon the surface on which it rests is a resultant of themotion imparted to the guide in composition with the motion imparted tothe rod. The direction of the path of thetracing-point is determined bythe relative velocities of its two component motions.` Where it isdesired thatthis point may have the choice of aninnite number of guideare in each'case a variable-speed device in which a unit velocityderived from a common source may be varied in a continuous se-l ries ofvelocities to zero and through zero by a series of velocities oppositein direction to yan opposite unit velocity. Moreover, by'suit- `ablemeans the velocity at any desired phase of the series becomes constant.The Value of the ratio of a velocity in one device to a velocity in theother may be anything from zero to plus or minus infinity. Plusinfinity, for` IOO example, is the value of the ratio when any positivevelocity in one device is compared with zero in the other. Itis furtherdesirable that the velocity of the resultant be not varied by variationin the value of the ratio of the components-z'. e., that speed oftracing be unaffected by direction. The necessary velocity from eachdevice to be communicated, respectively, to the rod and to the guide inorder that a resultant of a required direction may be obtained isascertainable from an empirical law of the composition of velocities.Where two velocities are developed in'directions transverse to eachother,the ratio of the component velocities reappears in the ratio ofthe cosines of the complimentary angles formed by the inclination of theresultant to the direction of the components. Since the angles own sineis the equivalent of the cosine of its complement, it follows that anequivalent expression of this law is: If a velocity proportional to thecosine of' an angle be compounded at right angles with a velocityproportional to the sine of the same angle, that angle will appear asthe inclination of the resultant to the given component. In this lawalso is the solution of the problem of constant resultant velocity, forif two velocities proportional to the sine and cosine of an angle becompounded at right angles the resultant will be proportional to aconstantviz., the radius of the measuring-arc. The maximum value of sineor cosine equals the radius. To this the unit velocity of thevariable-speed device corresponds.

In obedience to the laws stated one speed device is adapted to variationas the sine of an angle and the other device to variation as the cosineof the angle. In each case the device from whichl the variation isderived is a rod movedin simple harmonic motion by the rotation of acrank. The rod has freedom of movement in thedirection of its length,which is parallel to a diameter of the circle in which the crankrotates. It carries perpendicular guides in which a pin at the end ofthe crank plays freely in the direction of their length. That element ofthe motion of the crank perpendicular to these guides is communicated bythem to the rod on which they are carried. This element of the motion ofthe crank varies as the sine of an angle through which the crank turns,from that position which i-s parallel to the guides and as the cosine ofthe angle to that position of the crank which is perpendicular to theguides. These facts enable the control of the speed devices to be madeby a single means. The paths of the two rods movable in harmonic motionare made parallel, and the cranks are placed in quadrature-z'. e., at adistance of ninety degrees. The cranks, one in its initial positionparallel to the guides, the other parallel to the rods, are fixed to thesame axis of rotation. Any angular movement of the axis will produce inthe two rods motion proportional, respectively, to the sine and cosineof the angle through which the shaft is rotated. To the rods thusconstrained to movement in simple harmonic motion is delegated thevariation of the velocities developed in the speed devices, the fact tobe especially bornein mind being that the distance each rod moves fromits initial or middle position is proportional to the sine of the anglethrough which its crank on the controlling-axis is turned.

A great variety of variable-speed devices may when controlled by theharmonic rod be adapted to furnish the desired velocity ratios.

In general methods of speed variation in a machine fall into twoclasses. One varies the power supplied, the leverage remaining constant.The other varies the leverage, the power remaining constant.

An example of the first method, in which the variation would follow theprinciples of the geometric tracer, is an electric motor in which thestrength and direction of the current are controllable by the harmonicrod and proportional to its movement. In general any device in which thestrength and direction of the power are capable of a series ofvariations is adaptable to the purpose.

Speed variation by the second methodt'. e., the variation of theleverage, while the power remains constantis especially suited to thepurposes of this instrument where very little power is required andwhere certainty and continuity of velocity ratios are desirable.

A simple form of variable-speed device from which the desired series ofvelocities may be obtained is a friction-gear consisting of a disk wheeland traversing pulley in which the movement of the pulley across theface of the disk is made either equal or proportional to that of theharmonic rod. The velocity and direction of rotation of `the drivenpulley depend upon its distance and direction from the center of thedisk Wheel.

Similar results may be obtained from friction-cylinders by varying thedirection of their axes. Various conical gears are also mechanicalequivalents for this purpose.

The magnetic friction-gear shown in the accompanying drawings isespecially adapted to meet every requirement of the curve-tracer. Asembodied in one form, a follower or driven member is a cylinder ofuniform radius. The driver is a segment of a sphere which rotates abouta radius of the sphere as an axis, the axial radius being central 'tothe segment. Suitably-arranged electric coils make the cylindermagnetic, with a consequent pole midway of its length. The driver isalso magnetic and is held against the face of the cylinder with apressure proportional to the strength of the magnetic field. Thispressure or pull, being self-contained, is not communicated to thejournals of either the follower or the driver, where it would result ina detrimental friction. The segment rotates with a uniform angularvelocity. Thelinear veloc- ICO IIC

ity of any point on its surface varies as its perpendicular distance tothe axis of rotation, the velocity of a pointin the line of the rollingmotion of the driving member is obcrank and crank-shaft.

tained through its connection with the harmonic rod, which in turn iscontrolled bythe Since the amount of rolling motion of thedriving-member with reference to the driven cylinder determines thevelocity at which the cylinderis driven,

it follows that the velocity of the cylinder is also proportional to thedistance through which the harmonic rod is moved. In short, there isprovided a shaft bearing two cranks,

the rotation of which through any angle moves two harmonic rods throughdistances proportional-to theV sine and cosine of that angle. Theharmonic rods vary the radius of the drivers in two speed devices in thesame sine and cosine proportion. The motion of the driven member of eachdevice is independently communicated to one of two transversely-movablemembers of'a movable sys'- Y Fig. 3 is a top plan of the same.

` shown in Fig. 5.

tern of guides. The motion of the guides is compounded in the motion ofa point carried by them, and the inclination of the path of the point tothe direction of one of these guides is the angle through which theshaft was turned. The extent and direction of the rotation of this shaftare determined by astep-by-step device under telegraphic control. Asimilar step-by-step device regulates the prime mover and determines thevelocity and extent of tracing. Great facility isl obtainable in thiscontrol by the employment of the instruments and means of ordinarydiplex telegraphy. The telegraphic problems of repeating, automaticrelaying, &c., therefore present no obstacles.

The embodiment ofthis invention, a's illustrated in the drawings, willnow be understood.

In the drawings, Figure 1 is a side elevation showing a geometric traceror receiving instrument, a conventional motor for supplying power tosaid receiver, and a transmitter. Fig. 2 is an end elevation of thesame. Fig. 4 is a top plan view, on an enlarged scale, with the upperdeck of the machine removed in order to illustrate more clearly theparts beneath. Fig. 5 is a longitudinal verticalsection of the pen-arm,showing the means for controlling the vertical position of the pen andcertain elements of the means for actuating the penarm. Fig. 6 is a topplan View of the parts Fig. 7 is a view, on anv enlarged scale on theline R R of Fig. 5, lookder to allow such shaft to rotate.

`ing in the direction of the arrow and showing the means for guidingthe'reciprocating element of the penarm. Fig. 8'is a transverse sectionon the line S S of Fig. 5. Fig. 9 is a section al detail of thepen-holdin g tube. Fig. 10 is an end view of one of the variablespeeddevices, the harmonic rod, and the controlling means therefor. Fig. 11is a top plan view'of the parts substantially as vthey appear in Fig.10. Fig. 12 is a detail,'partially in elevation and partially insection, of certain features of the variable-speed` devices. Fig. 13 isa sectional View taken through the center of one of the variable-speeddevices, parts being shown in end elevation. Fig.'14 -is a detail,partially in end elevation and partially in section, looking'from theright of Fig. 13. Fig. 15 is an end elevation looking from the left ofFig. 14, showing the bearings for one end of the guide-rod. Fig. 16 is adetail, partially inv plan and partially in sec'- tion, showing theangle-changing shaft, with the means for actuating it, and thespeedchanging shaft, with the means for actuating it. Fig. 17 is asectional view, on an enlarged scale, of certain of the parts shown inplan in Fig. 1,6. Fig. 18 is a perspective of certain of the parts shownin Fig. 17, showing alsov portions of the escapement device -by whichthe angle-changing shaft, which is normally under tension, may bereleased in or- Fig. 19 is an elevation of one of the sets of escapementmechanisms and the electromagnets by which IOO it is controlled. Fig. 20is an .elevation at right angles to the view of Fig. 19, showingsubstantially the same parts. sectional elevation of a part of thespeed-varying means for one of the variable-speed devicesy Fig. 22 is aside elevation of the parts shown in Fig. 2l looking from the left. Fig.23 is a sectional detail on the line X X of Fig. 21. Fig. 24 is asectional view on the line Y Y of Fig. 22 with certain parts beneathomitted. Fig. 25 is a topplan View of the transmitter. Fig. 26 is a Viewof the same, partially-in section and partially in side elevation. Fig.27 is an end elevation ofthe same. Fig. 28 is a sectional detail on theline Z Z of Fig. 25. Fig. 29 is a view, on an enlarged scale, partiallyin section and partially in elevation, of certain elements of the unisondevice. Fig. 30 is a top plan of the same. Y spring-controlledstop'constituting' an element of the unison device. Fig. 32 is an end.

elevation, partially in section, taken at right anglesl to the view'ofFig. 28. Fig. 33 is a side elevation of an alternating contact deviceforming'an element in the control of the lifting of the pen-arm.

vation of the same. Fig. 35 is a diagram- Fig. 31 is a perspectivedetail of'a` Fig. 34 is an end ele- Fig. 21 `is a lIO rgo

. tacts, transmitting-keys, or the like.

comprises a transmitting instrument and a receiving instrument at eachend of the line. While the transmitter at one end of the line is beingoperated to send signals into the line and to the receiving instrumentat the other end of the line, the instrument at the transmitting end ofthe line, which is controlled by the same circuit, would act merely torecord graphically the operations of the transmitter for the guidance ofthe operator. Theoretically, of course, the line would be complete whenequipped with a transmitter at one end and a receiver at the other.

The receiver-The receivers embodied at any point of the line are alike.A platen upon which the motions of the pen-arm are recorded may beprovided with any suitable surface adapted to receive impressions orcapable of recording or characterizing the movement thereof, as passingover a series of con- In the present instance it is shown, as in Figs. 1and 3, as comprising simply a paper-holding table 1, adapted to beadjusted by leveling-screws, one of which is shown at 2. The size orcharacter of this platen is determined only by practical considerations,since it is theoretically unlimited. The penholder, which is adapted tohave universal movement over the surface of the platen, is pivotallycarried at the end of a reciprocable pen-arm. This penholder comprises amember 3, Fig. 5, which is pivotally mounted at one end within the outerend of the pen-arm and which carries at the other end a shortinternallythreaded tube 4, in which is carried the penholding tube 5,which is provided with external screw-threads throughout a portion ofits length in order that it may be adjusted by screwing down into thetube 4C. Further adjustment of the reproducing member proper, which inthe present instance is shown as a lead, is provided for by making thelower end of this tube internally threaded, so that the lead may beadjusted with relation thereto by screwing it up or down within thetube. The lower end of this tube is split by a series of vertical kerfsextending from the lower end up toward the point at which the tube isexternally threaded and adapted to be compressed in order to clamp thelead by a clamping-sleeve 6, which is threaded at its upper end toengage the external threads on the tube. The upper end of the tube maybe provided with a knurled head 7 for convenience in adjusting.

It will be seen upon inspection of Fig. i) that the internal threads onthe lower end of this tube have their bottoms flush with the interiorwall of the tube, so that the lands of the thread are raised above saidinner wall. This gives a better grip upon the lead when it is inposition within the tube and at the same time allows the lead to beturned up or down easily within the tube as it is worn oif withouthaving resistance oered to such turning by contact of the lead with thewalls of the tube above the threaded portion thereof.

The pen-arm comprises a swinging sleeve S and a rod 9, reciprocablymounted within said sleeve, which carries at its outer end the penholderproper, already described. As shown in Figs. 5 and 7, there is providedat the forward end of the sleeve a spring-arm l0, adapted to be adjustedby a set-screw 1l and carrying a roller 12, which acts to guide thereciprocable pen-arm,which throughout a portion ofits extent is tubular.In lugs 13, projecting from the end of the sleeve, there is journaled aroller 14, which engages with the lower side of the tubular arm andcoperates with the upper roller in guiding said arm. One or both ofthese rollers may be provided with an annular flange, which passesthrough a slot in the tube in order to assist in guiding and steadyngthe motion of the arm. A flange is shown at 15 in connection with thelower roller and the slot 16 in the pen-arm. The rear end of thereciprocating pen-arm is formed with dat sides 17 and with a groove inits top in order to provide suitable bearing-surfaces for ball-bearings,by which it is adapted for free movement within the sleeve. This sleeveS is pivotally mounted on a support in the form of a cylinder 18, whichdepends from a platform 20, raised above the base and suitably supportedtherein, which for convenience and to differentiate it from the base 19and from the upper platform ordeck 21 may be termed the second deck, andis provided around its lower periphery with a groove 22, cooperatingwith adjustable cone-nuts 23 23 to furnish a raceway for itsball-bearings. These cone-nuts are screwed down into aninternally-threaded socket 24C, which is rigid with the sleeve 8. Thesleeve may also be provided with a cage formed of webbed side members 2525 and cross-bars 26, which will serve to steady the swinging movementof the sleeve and assure freedom from vibration by the provision ofguy-wires 27, connected at one end to eyes 28 at the outer ends of thesleeve and at the other to adjustable hook-bolts 29 in the cage. At therear end of the sleeve and rigidly connected therewith is a groovedsegment 30, around which pass the ends of band 31, which ends aresuitably connected to the rear of the segment at 32, with interposedsprings 33, if desired. This segment is struck on a curve, the center ofwhich is at the pivotal center of the swinging sleeve S, this being thepreferable construction for obtaining uniformity of swing in allpositions of the arm. The band31 passes also around two pulleys 34, asshown in Fig. 2 and in dotted lines in Fig. 4:. Thus it will be seenthat when one of the pulleys 34 is rotated the segment and sleeve willbe swung from the pivotal center, the

sleeve carrying with it the pen-arm Whether IOO IIO

which is supported, by means of threaded adjustable dead-centers 36, inhangers 37, projecting downwardly from the second deck, while the other'pulley is mounted upon the shaft 38 betweenthe two hangers 40. Thisshaft 38 carries also a sprocket-wheel 41, driven by a chain 42 from asprocket 43 at the end of a shaft 44.

The reciprocable element of the pen-arm is controlled by means of a cord45, one end of which is connected at any desired point, as at 46,intermediate the length of said arm and the other end to anadjustablenut 47 upon the outer end of the arm. This cord passes overtwo guide-pulleys 48, situated at the pivot-al center of the arm, andaround a spirally-grooved pulley 49. Upon rotation of pulley 49 the cordwill be wound in one direction or the other and the pen-arm extended orretracted, as the case may be. The pulley 49 (best shown in Fig. 2) ismounted upon a shaft 50,-journaled in dead-centers from hangers 51,depending from the second deck, a spline-and-feather connectiontherebetween being provided. The shaftl 50 is driven, by means of achain 52 and a sprocket 53, from a shaft in connection with one of thevariable-speed devices.,

General transmission of 'velocity-Masmuch as the velocity element of thepower supplied by the motor is the more important from the standpoint ofthis invention,the power element may be neglected, and the term velocitywill be uniformly used throughout this specification.

The power or velocity is supplied by a motor 54, which may be of anydesired type. Its driving-shaft is equipped with a grooved pulley 55,over which passes a band 56, by which is driven a grooved pulley 57,carried at the end of a shaft 58, suitably journaled at one end, as at59, on the second deck and continued in the shape of a iiexible shaft60, which carries at its end a spur-gear meshing with a spur-gear on thedriving member of a variable-speed device, (designated generally by A.)The motor 54 is constantly driven; but the velocity supplied therefromto the re- -ceiver is regulated by the variable-.speed device A. Thisvariable-speed device may in itself 'be considered as a motor developinga variable velocity, and it will hereinafter be called thevelocitysupplying variablespeed device. This term is applicable, sincethe driven shaft 61 of this variable-speed device (show.n in dottedlines in Fig. 4) is extended in the shape of two flexible shafts 62 63,one at'each end of the machine, which.

carry spurgears, by which are driven the driving members of twoadditional variablespeed devices B 0. These additional variable-speeddevices are controlled in accordance with the sine and cosine law fromthe main crankshaft 64 of the instrument, and

the guides of the driving-segments are, in efbers of which are inreverse order from that of the other variable-speed devices. Theshaft'of the driven member of this variablespeed device is extended inthe form of the flexible shaft 66. This shaft has a featherand-splineconnection at its end with a studshaft 44, journaled on the second deckat 67 and carrying at its end the sprocket 43, from which through theintermediate means described a swinging movement is given to thepen-arm. The shaft of the other harmonic variable-speed device C drives,by means of a chain-and-sprocket connection, the shaft 50, upon whichshaft is the spirally-grooved pulley 49, the rotation of whichreciprocates the pen-arm, as already described.l It will accordingly beseen that the velocity derived from. the motor is under the control ofthe variable-speed device A, and from said Variable-speed device it istransmitted in two separate paths, one through the variablespeed deviceB to the swinging or transverse element of the pen-arm and the otherthrough the variablespeed device C to the extending element of thepen-arm, the two velocities being compounded at the recording-point.

The odrz'ablespeed devices nmdetat'L-It will now be necessaryin order tounderstand the means for applying the theory already laid down that theconstruction of the variable-speed devices should be specifically setforth.

The four sets of variable speed devices shown in Fig. 4 are alike inprinciple, the main difference being in the means for varying therelation between the driving and the driven members. In the case ofthose shown at 'B C the relation of the driving and driven members isvaried by rotation of the main crank-shaft 64 and the connectionsbetween the cranks and the guide-rods of the driving members, wherebythe movement of these guide-rods in shifting the position of the drivingmember is a movement following the laws of simple harmonic motion. Inthe case of the variable speed device D, which acts merely as means forthe transmission of velocity from the driven shaft of the variablespeeddevice B, a means is provided for varying the relation between thedriving and driven members in order to compensate for ICO IIO

the varying lengths of the reciprocable penpose one of the guide-rods ofthe driving member is connected to a system of levers, by the action ofwhich, as controlled by signals sent through the line, any desiredrelation between the driving and driven members may be obtained.

One of the harmonic variable-speed devices is illustrated in detail inFigs. 10 and 11 and the velocity-supplying variable-speed device A inFigs. 12, 13, and 14.

Referring first more especially to Figs. 12, 13, and 14, a shaft 61 ismounted, by means of ball-bearings held in place by an adjustablecone-nut 68, in supports 69, which are mounted upon the second deck.Carried either integral with this shaft or drivefitted upon annularflanges 70, projecting therefrom, is a cylinder 71 of uniform radius,which constitutes the driven member of the couple. The driving member isin the form of the segment of a sphere 72, supported upon the end of ashaft 73, the axis of which is in a radial line of the sphere. Thisshaft is rotatably mounted near the end in a sleeve 74C by means ofball-bearings held by an ad- Projecting upwardly justable cone-nut 75.and downwardly from the sleeve 711 are arms 76, provided with eyes attheir ends. These eyes provide supports for the ends of arms 77, theposition of the arm with reference to the eye being adjustable by meansof the nuts 78, which are screwed onto the arm, one on each side of theeye. The other end of the arm 77 carries a pivot-screw 79, held inadjusted position by means of a lock-nut 80. Cross-rods 81 extendbetween the standards, one above and one below the cylinder, and thesecross-rods carry guide-arms S2, which are adjustably held thereon bymeans of the nuts 83, said guide-arms being positioned to providepivotal supports for the ends of the pivot-screws 79. For this purposethe guidearms are provided with longitudinal slots 84, within which thepivot-screws may play back and forth in a plane at right angles to theaxis of the driven cylinder, the pivot-screws themselves being in aplane which is tangent tothe surface of the driving-segment at itsmiddle point. It will be thus seen that by manipulation of the nuts 78the arms 77 can be adjusted inthe direction of their length, and byloosening the nuts on each side the arms may be rotated for adjustment.The cross-rods 81 may be adjusted by loosening the nuts 85, by whichthey are held to the supports, and rocking the guide-arms 82 to providecorrect pivotal points of support for the driving-segment in order thatwhen rolled upon the driven segment its movement may correspond to themovement of the harmonic rods. A second bearing for the shaft 73 isprovided at a point which is at the center of the curvature of thesegment in a frame 86, adjustable ball-bearings being provided, asbefore, by a cone-nut 87, which cooperates with a conical recess formedin theframe. The two bearings of shaft 73 are connected by tube S8.Frame 86 is mounted within an outer frame 89 by means of pivot-screws89, so that it has a free turning movement on an axis perpendicular tothe axis of rotation of the spherical segment and passing through itscenter of curvature. Extending from each side of the frame 89 areguide-rods 90, here shown as triangular in shape and supported, by meansof baILbearings, within boxes 91 on the second deck, so as to havefreedom of motion in a longitudinal direction. These boxes 91 arepreferably provided with split bearing-tubes 92, of slightly-resilientmaterial, which are interiorly cylindrical to provide a raceway for theantifriction-balls and which are exteriorly tapered toward their ends.Into the ends of the boxes are screwed locking and adjusting nuts 93,which are interiorly tapered to correspond to the taper of the splitsleeve 92, as shown in section at the left of Fig. 11i.

In the case of the velocity-supplying variable-speed device shown inFigs. 12, 13, and 14 the shaft of the driving-segment is carried by theframe 86, near the lower end there of, and at the upper end of saidframe there is a box 94, which is provided with suitable cones andadjustable cone-nuts 95 for a short stud-shaft 96, which carries at itsend a spurgear 97, meshing with the spur-gear 98 on the end of the shaft73. This box may be adjusted relatively to the frame by means of asetscrew 99 and held in adjusted position by the locking-screws 100. Theshaft 60, preferably exible, as shown, formsa continuation ofthestud-shaft, and this shaft is driven, as already described, from themotor 5i. Both the shafts 73 and 96 are free to move longitudinally withrelation to their bearings.

In the case of the harmonic variable-speed devices B C, one of which isillustrated in Figs. 10 and 11, the shaft of the driving-segment issupported at the upper end of the frame 101, and the gear 102, by whichit is driven, meshes with a lower gear 103, driven by the flexible shaftG2, which forms a continuation of the shaft of the velocity-supplyingvariable-speed device. The construction, save for this reversal ofplanes of the shaft of the driving-segment and the fiexible shaft bywhich it is itself driven, is the same as that of the velocity-supplyingvariable-speed device.

As shown in section in Fig. 12, the ends of the shafts 61, which carrythe driven cylinders of the Variable-speed couple, are in each casesurrounded by a coil 104:, which coils are included in a suitablecircuit and so arranged as to provide a consequent pole midway of thelength of each cylinder, the cylinders, segments, and shafts being allof suitable magnetic material. As shown, the coils are wound aroundsuitable spools 105 and are protected by housings or caps 106,which havea threaded connection with the supports G9. Any suitable winding orarrangement of coils maj` be provided, however, which will tend to causelIO

